Signalized Intersections: 1985 Through 2000

Between 1980 and 1985, the Highway Capacity and Quality of Service Committee moved to adopt a signalized intersection methodology based upon critical movements. This approach to timing and analysis of signalized intersections had been used by Bruce Greenshields in the early 1950s, and had been developed by Don Berry and others. The methodology incorporated into the 1985 HCM [1] was based on the work of Carroll Messer and Dan Fambro [2], which was modified and calibrated under an NCHRP contract by William Reilly of JHK and Associates [3].